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3 Commits

Author SHA1 Message Date
Ruslan Bukin
3d5b3b0a44 Tune xDMA interface slightly: 
o Move descriptors allocation to DMA engine driver
o Add generic xdma_request() routine
o Add less-generic scatter-gather application based on xdma interface

Typical operation flow in peripheral device driver is:

1. Get xDMA controller
sc->xdma_tx = xdma_ofw_get(sc->dev, "tx");

2. Allocate virtual channel
sc->xchan_tx = xdma_channel_alloc(sc->xdma_tx, caps);

3. Setup transfer status callback
xdma_setup_intr(sc->xchan_tx, my_tx_intr, sc, &sc->ih_tx);

4. Request a transfer(s)
ret = xdma_request(sc->xchan_tx, &req);

5. Free the channel
xdma_channel_free(sc->xdma_tx);

6. Free the controller
xdma_put(sc->xdma_tx);

Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14971
 2018-04-12 15:36:24 +00:00
Jared McNeill
7fd348080f The JZ4780 I2S can feed either the internal audio codec or the HDMI 
transmitter, but not both at the same time. This patch:

 - Adds a dev.pcm.0.internal_codec sysctl node for selecting between
   internal and external codec
 - Changes playback sample rate from 96 kHz to 48 kHz for HDMI compatibility
 - Enables i2s clock on codec access

Reviewed by:		br
Differential Revision:	https://reviews.freebsd.org/D8960
 2016-12-29 14:00:10 +00:00
Ruslan Bukin
b6a250518a Add jz4780 AIC (Audio Interface Controller) driver. 
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D8808
 2016-12-20 18:27:53 +00:00